Abstract
Chemical vapor deposition (CVD) is a preferential method to fabricate carbon nanotubes (CNTs). Several changes have been proposed to obtain improved CNTs. In this work we have fabricated nitrogen‐doped multiwall carbon nanotubes (N‐MWCNTs) by means of a CVD which has been slightly modified. Such modification consists in changing the content of the by‐product trap. Instead of acetone, we have half‐filled the trap with an aqueous solution of NaCl (0–26.82 wt.%). Scanning electron microscope (SEM) characterization showed morphological changes depending upon concentration of NaCl included in the trap. Using high resolution transmission electron microscopy several shape changes on the catalyst nanoparticles were also observed. According to Raman spectroscopy results N‐MWCNTs fabricated using pure distillate water exhibit better crystallinity. Resistivity measurements performed on different samples by physical properties measurement Evercool system (PPMS) showed metallic to semiconducting temperature dependent transitions when high content of NaCl is used. Results of magnetic properties show a ferromagnetic response to static magnetic fields and the coercive fields were very similar for all the studied cases. However, saturation magnetization is decreased if aqueous solution of NaCl is used in the trap.
Highlights
After the discovery, structural identification, and bulk production of carbon nanotubes (CNTs) the interest of researchers about these nanostructures increased exponentially, and the big quest for novel applications started [1,2,3,4]
The chemical vapor deposition (CVD) configuration was modified to synthesize controlled morphologies in nitrogen-doped carbon nanotubes by increasing the density of the liquid trap used in the bubbler
The Scanning electron microscope (SEM) and HRTEM images revealed the fact that the morphology of N-MWCNTs was modified substantially exploding the versatility of CVD
Summary
Structural identification, and bulk production of carbon nanotubes (CNTs) the interest of researchers about these nanostructures increased exponentially, and the big quest for novel applications started [1,2,3,4]. Depending on the desired applications, modifications in the chemical vapor deposition (CVD) method offer an optional approach to induce some important properties to carbon nanostructures, such as the introduction of water vapor together with the inert gas flow to grow very large carbon. In other cases it is desirable to have defects in carbon nanotubes such as nonhexagonal rings, dangling bonds, doping, non-sp, and folding because they are the origin of producing many forms and new carbon architectures [12,13,14,15,16,17,18,19,20,21] by adjusting some parameters in the chemical vapor deposition (CVD) method. Notwithstanding, research about this method continues increasing because the mechanism of growth of CNT remains unclear
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
